Type-writing machine



(No Model.)

' W. G. FARNUM. TYPE WRITING MAGHINB.

N0. 571,757. Patented Nov. 24, 1896.

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INX ENTSR WILLIAM G-E ALRNUM WITNESSES UNTTED STATES WILLIAM C. FARNUM,OF

ATENT Trice,

ARLINGTON, VERMONT.

TYPE- -WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 571,757, dated November24, 1896. Application filed March 19, 1895. Serial No. 542,343. (Nomodel.

To all 1071,0111, it may concern:

3e it known that 1, WILLIAM C. FARNUM, aeitizen of theUnitedStates,residing at Arlington, in the county of Bennington and State ofVermont, have invented certain new and useful Improvements in'lypeJVriters, of which the following is a specification.

My invention relates to that class of typewriters in which a movablepaper-carriage is used; and it consists of suitable adjustable stops forregulating the movcm ent of said carriage and a cooperating alarm-bell,as hereinafter described. As in the class of type-writers referred tothe extent of movement of the paper-carriage determines the length ofthe written line, I propose to provide in this machine for the quick andeasy adjustment of the stops which limit said carriage movement to thevaried length of line required. I also attach to and operate inconjunction with one of the stops an alarm-bell, which warns theoperator of approach to the end of the line.

The device is shown in the accompanying drawings, of which- Figure l isan end elevation of the upper portion of a type-writer, showing thepapercarriage and the stop carrying the alarm-bell. Fig. is a plan viewof the stop and alarm mechanism, showing a small portion of the movablecarriage. Fig. 3 is a side elevation of one of the margin-stops and itsrack, in connection with the cooperating striker of the carriage. Figs.at and 5 are end elevations of the parts shown in Fig. 3. Fig. 6 is arear elevation, partly in section, of the parts shown in Fig. 2, takenon the line X Y, Fig. 2.

Similar letters refer to similar parts in the several views.

In the drawings, A is the base or frame of the machine, and B is themovable carriage, which in this case is carried on the rollers E and F.The position of the keyboard is indicated by the key B. A forwardimpulse or movement in the direction of the arrow 0, Fig. 2, is giventhe carriage at each key depression. Attached to the stationary base orframe A is the toothed rack G, which supports the margin-stops G and N,and by means of which rack said stops may be held at any requiredposition within the length of said rack. The stops G and N are toothedto en gage with the toothed rack, and the teethare arranged to bedisengaged and the stops to be moved longitudinally on said rack foradjustment, as hereinafter described. The stop N also carries abell-supporting top plate ll,

thickened at its inner end to serve as a counterbalance to the bell J,which is secured below the plate at its outer end by the screw j. Abell-clapper K is hung on a pivot P, which pivot finds its top bearingin the plate H and its bottom bearing in. a projection a, Fig. (3, ofthe stop N. The hub of the bell J is grooved across its top end for thereception of a spring L, Fig. 2, which spring is held in position by thetop plate ll. At its opposite end the spring L bears against thebell-clapper and holds it normally in the position shown in Fig. 2. Thetension of this spring maybe varied by turning the bell around the screwj.

The movable carriage is provided with a striker D, adapted to impingeagainst either of the margin-stops G and N and to check the carriagemovement as either end of the rcquired line is reached, but at the sametime permitting the optional raising of the marginstops and thecontinuation of this movement beyond the fixed limit of the line andalso permitting the free return of the carriage within the limit of saidline without disturb ing the setting or adjustment of the stops. Thecarriage also carries one or more pins M M, which are so located as tooperate the bellclapper shortly before the end of the line is reached asthe carriage moves in the direction of the arrow 0, Fig. 2.

In practice the margin-stops are set to de termine the length of line asfollows: The finger is pressed downward in the recess 71-, which isprovided for the purpose on stop G. This brings the step into the tiltedposition shown in Fig. 5, when the teeth I'- of the step are raised outof engagement with the teeth of the rack 0, thus permitting the slidingof the stop to any point on the rack, providing it does not pass thestriker D, which it cannot do when in this tilted position. The stop Gis provided with an inwardly-projeoting lip Z, which when the stop istilted to disengage its teeth strikes against the lower face of the rackO and, sliding freely thereunder, prevents the further tilting of thestop. The

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normal and fixedposition of thestop with its teeth in mesh with those ofthe rack is shown in. dotted lines in Fig. The stop IT is constructedand operated similarly to the stop G, as far as its adjusting andretaining features are concerned. In depressing the stop N, however, thetop plate is grasped instead of the finger-piece 7L on the stop G. Aswhen the machine is writing the carriage moves in the direction of thearrow or from right to left, the carriage preparatory to writing ispropelled to the right till the bottom portion of the striker D strikesagainst the projecting lip g of the stop G, shown in Fig. As the writingprogresses the carriage moves in termittently in the direction of thearrow till striker D reaches the position shown in dotted lines in Fig.2, which is shortly before the terminus of the line is reached. Theleading one of the pins M M now engages the pro ,jecting lip K of thebell-clapper and swings the clapper into the dotted position shown.Further movement of the carriage releases the clapper, which is swungback by the spring 1 with sullicient momentum. to carry said clapperpast its normal position and into impingement against the bell, when,its n10- mentum being checked, it is returned by the spring to itsnormal position. This belltapping is repeated by the next pin. Acontinuanee of the carriage movement causes the lower portion of thestriker D to strike against the projecting lip 11 of the stop N andcheck further movement. The carriage may then be returned to its formerposition, bringing the striker D into contact with the stop G. If,however, it is desired to continue the movement of the carriage beyondthe limit of either margin-stop, this maybe done by tilting the stopafter the striker D has reached the position of impingement thereagainsttill the top of the projecting lip g of stop G or n of stop N strikesthe lower surface of the projecting top plate (Z of the striker D, asshown in full lines in Figs. 3 and i. The striker D is now free to passthe stop as the projecting lip g or 7L slides through 1 he groove 1) inthe striker D provided therefor. The projecting top plate (Z preventsthe stop from tilting sufficiently to disengage its teeth from those ofthe rack, thereby effectually locking the stop for as long a time as itslip remains within the groove of the striker D. As the striker-D passesbeyond it the stop drops to its normal position, and as the strikerrepasses the stop 011 its return it lifts crate the bell.

to the starting-position fora newline the DIES the stop by means of thebeveled lip gin the i case of the stop G, as shown in dotted lines,

Fig. 0, or the beveled bottom edge of the bell-clapper lip K on stop N,so that the ;ll repasses through the groove in the striker D. as before.

The bell-clapper lip K 011 stop N projects slightly beyond the lip n, sothat the pins AI M may pass the lip a and strike the lip K to up- As thecarriage is returned M M pass under and lift the lip K.

The teeth of the rack C may be made or a pitch equal to the space of oneletter on :he type-writer. Then the lips g and n may be made of suchwidth that the carriage when checked by said steps will always be at :heneutral point between two of the said letterspaces, when the teeth andstops are so :1rranged that the teeth on the rack may oe numbered, asshown in Fig. 2, for convenienoe in counting the number of letters in aline in setting the stops.

Having thus described my apparatus. 1 claim as my invention, and desireto secure by Letters Patent, the following:

1. In a type-writer the combination with a toothed rack of a margin-stophaving teeth adapted to engage with those of the rack. means for tiltingsaid stop to effect disengagement and a rigid retaining-lip on said stopto check the tilting of same when the teeth have swung out of engagementand allow the stop to be slid lengthwise of :he rack, substantially asspecified.

2. he combination of the tilting stop with the carriage carrying thestriker provided with the groove for permitting the striker :0

pass beyond the said stop at will, and the top plate for preventing thetilting of the said step for disengagein entwhen. such movement isunnecessary, substantially as described.v

The combination of the grooved striker D attached to the movablecarriage and the stops G and N beveled on one side so as o slide throughsaid grooved striker in one direction and strike against same inopposite direction, substantially as described.

4:. The combination with the alarnrbell of a type-writer of the clapperK the spring L and the adjusting-screw j upon which the bell maybeturned to tighten the sprin su o stantially as specified.

In testimony whereof I have hereto subscribed my name this lUth day ofMarch. 1895.

WILLIAM C. FARNUM.

In presence of FRANKLIN Scorr, EMILY Scorr.

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